Method for hydrocarbon injection into an exhaust system, upstream of a turbocharger, while minimizing exposure of the exhaust gas recirculation system to the same hydrocarbons
First Claim
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1. An engine for reducing buildup in an exhaust gas recirculation system when mixing hydrocarbons with exhaust comprising:
- an exhaust system including;
a first engine cylinder in communication with a first injection system, the first injection system configured to inject hydrocarbons into the first engine cylinder;
a first exhaust passage in communication with the first engine cylinder;
the first injection system configured to provide hydrocarbons to the first exhaust passage when the first engine cylinder moves a first exhaust gas into the first exhaust passage;
a second engine cylinder in communication with a second injection system, the second injection system configured to inject hydrocarbons into the second engine cylinder;
a second exhaust passage in communication with the second engine cylinder;
the second injection system inoperative when the second engine cylinder moves a second exhaust gas into the second exhaust passage;
wherein the first exhaust passage and the second exhaust passage are separated from each other to inhibit entry of the first exhaust gas into the second exhaust passage.
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Abstract
The present invention generally relates to engines, and, more particularly, to an exhaust system for reducing buildup in an exhaust gas recirculation system when mixing hydrocarbons with exhaust.
22 Citations
33 Claims
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1. An engine for reducing buildup in an exhaust gas recirculation system when mixing hydrocarbons with exhaust comprising:
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an exhaust system including; a first engine cylinder in communication with a first injection system, the first injection system configured to inject hydrocarbons into the first engine cylinder; a first exhaust passage in communication with the first engine cylinder; the first injection system configured to provide hydrocarbons to the first exhaust passage when the first engine cylinder moves a first exhaust gas into the first exhaust passage; a second engine cylinder in communication with a second injection system, the second injection system configured to inject hydrocarbons into the second engine cylinder; a second exhaust passage in communication with the second engine cylinder; the second injection system inoperative when the second engine cylinder moves a second exhaust gas into the second exhaust passage; wherein the first exhaust passage and the second exhaust passage are separated from each other to inhibit entry of the first exhaust gas into the second exhaust passage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for reducing buildup in an exhaust gas recirculation system when mixing hydrocarbons with exhaust comprising the steps of:
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providing a fuel injection system to provide hydrocarbons to a first cylinder during an exhaust cycle of the first cylinder such that the hydrocarbons enter a first exhaust passage, the fuel injection system inoperative to provide hydrocarbons to a second cylinder during the exhaust cycle of the second cylinder such that the hydrocarbons do not enter a second exhaust passage; providing the hydrocarbons to the first exhaust passage to cause active regeneration; recirculating at least a portion of exhaust from the second cylinder by way of the second exhaust passage, the second exhaust passage isolated from the first exhaust passage; and substantially impeding the hydrocarbons from entering the second exhaust passage. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. An engine for reducing buildup in an exhaust gas recirculation system when mixing hydrocarbons with exhaust comprising:
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means for providing hydrocarbons to a first exhaust passage to cause active regeneration; means for recirculating at least a portion of exhaust from a second exhaust passage isolated from the first exhaust passage; and means for substantially impeding the hydrocarbons from entering the second exhaust passage.
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23. An engine for reducing buildup in an exhaust gas recirculation system when mixing hydrocarbons with exhaust comprising:
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an exhaust system including a first exhaust channel in communication with a first exhaust passageway and a second exhaust channel in fluid communication with a second exhaust passageway, the first exhaust passageway isolated from the second exhaust passageway; a first injection system adapted to provide hydrocarbons to a first engine cylinder and the first exhaust channel; and an exhaust gas recirculation tube coupled to the second exhaust passageway, wherein the first exhaust passageway is isolated from the second exhaust passageway between the first engine cylinder and the exhaust gas recirculation tube. - View Dependent Claims (24, 25, 26, 27)
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28. An engine for reducing buildup in an exhaust gas recirculation system when mixing hydrocarbons with exhaust comprising:
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an exhaust system including a first exhaust channel and a second exhaust channel; a first injection system to provide hydrocarbons to a first engine cylinder and the first exhaust channel; an exhaust gas recirculation tube coupled to the second exhaust channel; and a barrier isolating the first exhaust channel from the second exhaust channel between the first engine cylinder and the exhaust gas recirculation tube. - View Dependent Claims (29, 30, 31, 32, 33)
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Specification